How to extract First_name & last_name from email using oracle REGEXP_SUBSTR,
Email: susan.ryan@email.com
Expected output:
First_name | Last_name |
---|---|
susan | ryan |
select
substr('susan.ryan@email.com',1,(INSTR('susan.ryan@email.com','.')-1)) first_name,
substr('susan.ryan@email.com',(INSTR('susan.ryan@email.com','.')+1),(INSTR('susan.ryan@email.com','@'))) last_name
from dual;
But i'm getting result as
first_name | Last_name |
---|---|
susan | ryan@email. |
You have
substr(email, instr(email, '.') + 1, instr(email, '@')) as last_name
But the second parameter is not the end position, but the requested length, so you must subtract the position of the dot:
substr(email, instr(email, '.') + 1, instr(email, '@') - instr(email, '.') - 1) as last_name
That's easier with REGEXP_SUBSTR
by the way:
regexp_substr(email, '[[:alpha:]]+', 1, 1) as first_name,
regexp_substr(email, '[[:alpha:]]+', 1, 2) as last_name
We are looking for substrings that only consist of letters in the e-mail here. For first_name we are taking the first such string, for last_name the second one. This relies of course on all e-mails in your table equally consisting of firstname.lastname@domain.
Here is the docs on REGEXP_SUBSTR
: https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/REGEXP_SUBSTR.html#GUID-2903904D-455F-4839-A8B2-1731EF4BD099
Here are some examples of how to do this. First remove the domain using SUBSTR
(column "domain") or REGEXP
(column "domain_regexp"), then split the portion before the domain (column "no_domain") using REGEXP_SUBSTR
:
WITH samples AS
(
SELECT '-susan.ryan@email.com' as str FROM DUAL UNION
SELECT 'roger@email.com' as str FROM DUAL
)
SELECT
str as email,
REGEXP_SUBSTR(str,'@.+$') AS domain_regexp,
SUBSTR(str, INSTR(str,'@')) as domain,
SUBSTR(str, 1, INSTR(str,'@') - 1) as no_domain,
REGEXP_SUBSTR(SUBSTR(str, 1, INSTR(str,'@') - 1),'[^.]+',1,1) AS first_name,
REGEXP_SUBSTR(SUBSTR(str, 1, INSTR(str,'@') - 1),'[^.]+',1,2) AS last_name
from samples;
EMAIL DOMAIN_REGEXP DOMAIN NO_DOMAIN FIRST_NAME LAST_NAME
--------------------- --------------------- --------------------- --------------------- --------------------- ---------------------
-susan.ryan@email.com @email.com @email.com -susan.ryan -susan ryan
roger@email.com @email.com @email.com roger roger
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